class_docstr: Route attribute access on a class to __getattr__.
  
  This is a descriptor, used to define attributes that act differently when
  accessed through an instance and through a class.  Instance access remains
  normal, but access to an attribute through a class will be routed to the
  class's __getattr__ method; this is done by raising AttributeError.
  
  This allows one to have properties active on an instance, and have virtual
  attributes on the class with the same name.  (Enum used this between Python
  versions 3.4 - 3.9 .)
  
  Subclass from this to use a different method of accessing virtual attributes
  and still be treated properly by the inspect module. (Enum uses this since
  Python 3.10 .)
code: def __delete__(self, instance):
      if self.fdel is None:
          raise AttributeError("can't delete attribute")
      self.fdel(instance)
  
imports: import sys
label_desc: Use image node_id 4 for calling the DynamicClassAttribute obj's underlying member method code with example usage: obj.__delete__(instance) without return types